US9629014B2 - Method for notifying interference measurement reference information, method and device for measuring interference - Google Patents

Method for notifying interference measurement reference information, method and device for measuring interference Download PDF

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US9629014B2
US9629014B2 US14/364,701 US201114364701A US9629014B2 US 9629014 B2 US9629014 B2 US 9629014B2 US 201114364701 A US201114364701 A US 201114364701A US 9629014 B2 US9629014 B2 US 9629014B2
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interference measurement
res
reference information
interference
reference signal
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US20150124717A1 (en
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Yu Ngok Li
Yijian Chen
Yunfeng Sun
Jun Xu
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present document relates to the technical field of communications, and in particular, to a method for notifying interference measurement reference information and a method and an apparatus for measuring interference.
  • CSI Downlink Physical channel state
  • CQI Channels Quality Indication
  • PMI Pre-coding Matrix Indicator
  • RI Rank Indicator
  • the CQI is an index evaluating the quality of the downlink channel.
  • the CQI is represented by integer values of 0 ⁇ 15, which represent different CQI levels respectively.
  • Different CQIs correspond to respective Modulation and Coding Schemes (MCS for short), which are divided into 16 conditions, and may be represented with 4-bit information, as shown in table 1 below.
  • the meaning of feedback of the CQI is that a UE selects a suitable transmission block modulation and coding level to be recommended to a base station according to the channel quality, so that the base station performs modulation and coding according to the information, and can achieve a channel transmission capability thereof to the best extent.
  • the CQI can also be considered as quantification of channel quality information, and if the quality is good, higher order modulation and coding mode may be supported, to obtain a higher speed, and if the quality is poor, transmission can only be performed in a lower order modulation and coding mode, to ensure the robustness of the transmission; and in the Multiple Input and Multiple Output (MIMO) technology, for the recommended CQI, there are generally following hypothesis.
  • MIMO Multiple Input and Multiple Output
  • the base station uses the recommended RI as the number of layers of spatial multiplexing, and transmits data with the number being RI at the same time, and uses a layer mapping mode specified in the protocol;
  • the CQI is calculated according to a Signal Interference Noise Ratio (SINR) obtained after being processed by the receiving algorithm.
  • SINR Signal Interference Noise Ratio
  • RI, PMI and CQI there are relatively mature algorithms to calculate the RI, PMI and CQI, for example, best RI, PMI and CQI are selected using a maximum capacity criteria.
  • the RI/PMI/CQI are not selected independently with each other, and the selecting algorithm is generally a unified selection.
  • the accuracy degree for calculating and selecting the RI/PMI/CQI is influenced by two aspects, i.e., channel measurement and interference and noise measurement.
  • the channel measurement may be based on a Common Reference Signal (CRS) or a Channel State Information-Reference Signal (CSI-RS) in the LTE/LTE-A system.
  • CRS Common Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • an accurate channel may be measured through the CRS or CSI-RS.
  • Interference and noise measurement is a technical bottleneck, and incorrect interference information may result in mismatch between the number of layers and an actual channel quality condition. For example, only 2 layers are actually supported, but it may be misjudged to support 4 layers due to a measurement error of the interference and noise information, thus leading to a high bit error rate.
  • only low order coding and modulation mode can actually be supported, however, it may be misjudged to support a high order coding and modulation mode, thus also leading to a high bit error rate.
  • Nose measurement is generally relatively simple, since noise is generated due to reasons of the devices themselves. Interferences primarily come from other cells or other nodes, and as the transmission technologies of other cells or transmission modes are different, for example, the pre-coding is different, or the transmitted signals are different, it may result in a change of the interference condition. Therefore, the interference measurement is a primary technical problem needed to be solved in the related art.
  • interference measurement methods which primarily include the following three methods: performing interference measurement based on a CRS, performing interference measurement based on a CSI-RS, and performing interference measurement based on a dedicated demodulation pilot or transmitted data.
  • An idea of the interference measurement based on a CRS is to use the interference experienced by the CRS as an interference experienced by a data signal. Such method is a current dominant method, and the interference experienced by the CRS and the interference experienced by the data are usually considered to be similar. In addition, due to a high density of the CRS, interference information and reference signal information can be distinguished to a certain extent according to the correlation of the channels. Therefore, the performance of the channel estimation is good. But a problem that patterns of the CRS among cells are the same (which is due to a high density) may frequently exist.
  • Another method is to perform interference measurement according to the CSI-RS.
  • the density of the CSI-RS is relatively sparse when the interference measurement is performed according to the CSI-RS, the interference performance is slightly poor.
  • the problem does not exist with the CSI-RS due to a low pilot density. Therefore, it may select to perform interference measurement using the CSI-RS.
  • Interference measured by the method for measuring interference based on a dedicated demodulation pilot or transmitted data is relatively accurate and precise. But the implementation thereof is relatively complex, and needs to depend on previous downlink data transmission, while the downlink data transmission does not always exist in each subframe, and there are downlink data only in part of positions in a frequency domain.
  • the terminal may perform interference measurement randomly by using the method which is considered to be better or other methods which are not mentioned.
  • any of the interference measurement technologies mentioned above may be suitable for interference measurement in a traditional cell or a traditional antenna configuration. Therefore, the base station may not limit the interference measurement for the terminal. But a problem that a system does not limit which method will be adopted for measuring interference for the terminal in the related art lies in that it is not suitable for a distributed antenna system.
  • the CRS configuration of the distributed antenna system uses a configuration method of a Single Frequency Network (SFN), and one or two antennas are virtualized as one CRS port by each transmission node; while the CSI-RS uses a local configuration method and each transmission node is configured with a set of CSI-RSs.
  • SFN Single Frequency Network
  • the distributed antenna system frequently uses a transmission mode of multi-user space division multiplexing, and transmission nodes with co-time co-frequency and different positions serve multiple different users. As shown in FIG. 2 , multiple transmission nodes therein belong to the same cell. After further analysis, it can be found that in such system, performing interference measurement based on a CRS can not reflect interference with the UE due to other transmission nodes within the cell with co-time co-frequency transmission resource positions. Therefore, it is better to perform interference measurement using a CSI-RS.
  • some UEs are combined to serve a certain terminal by antennas of all nodes using a same SFN mode as the CRS port. Redundant interference will be produced by calculating based on the CSI-RS measurement. Therefore, it may be more appropriate to perform interference measurement based on a CRS.
  • a base station needs to limit interference measurement for a terminal, and notify the terminal of corresponding interference measurement reference information.
  • the technical problem to be solved by the present document is to provide a method for notifying interference measurement reference information and a method and apparatus for measuring interference, wherein, a base station notifies a terminal of interference measurement reference information.
  • the present document provides a method for notifying interference measurement reference information, wherein,
  • a base station notifies a terminal of interference measurement reference information which specifies a reference signal used for interference measurement and/or a reference resource position for interference measurement.
  • the reference signal used for interference measurement specified in the interference measurement reference information comprises a Common Reference Signal (CRS), or a Channel State Information-Reference Signal (CSI-RS).
  • CRS Common Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the reference resource position for interference measurement specified in the interference measurement reference information is a set of part of Resource Elements (REs) within one or more Transmission Time Intervals (TTIs).
  • REs Resource Elements
  • TTIs Transmission Time Intervals
  • the set of REs is a set of multiple incompletely continuous REs.
  • the base station using high-level signaling, notifies the terminal of the interference measurement reference information which specifies the reference signal used for interference measurement and/or the reference resource position for interference measurement in the high-level signaling.
  • the interference measurement reference information is of 1 bit, which is used to instruct to perform interference measurement according to the CRS or perform interference measurement according to the CSI-RS; or
  • the interference measurement reference information is of 2 bits, which are used to instruct to perform interference measurement according to the CRS, performing interference measurement according to the CSI-RS, perform interference measurement according to a DMRS, or perform interference measurement according to data.
  • the base station jointly encodes the reference signal used for interference measurement together with a channel measurement reference information indication.
  • the present document further provides a method for measuring interference, comprising:
  • a terminal receiving interference measurement reference information notified by a base station, and performing interference measurement according to a reference signal used for interference measurement and/or a reference resource position for interference measurement specified in the interference measurement reference information.
  • the present document further provides an apparatus for notifying interference measurement reference information, applied in a base station, comprising a reference information notification unit, wherein the reference information notification unit is configured to notify a terminal of interference measurement reference information which specifies a reference signal used for interference measurement and/or a reference resource position for interference measurement.
  • the reference information notification unit is configured to specify the following reference signals used for interference measurement in the interference measurement reference information: a Common Reference Signal (CRS), or a Channel State Information-Reference Signal (CSI-RS).
  • CRS Common Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the reference information notification unit is configured as that the reference resource position for interference measurement specified in the interference measurement reference information is a set of part of REs within one or more TTIs, wherein, the set of REs is a set of multiple incompletely continuous REs.
  • the reference information notification unit is configured to notify the terminal of the interference measurement reference information using high-level signaling and specify the reference signal used for interference measurement and/or the reference resource position for interference measurement in the high-level signaling.
  • the reference information notification unit is configured to:
  • the present document further provides an apparatus for measuring interference, applied in a terminal, comprising a reference information reception unit and an interference measurement unit, wherein,
  • the reference information reception unit is configured to receive interference measurement reference information notified by a base station, which specifies a reference signal used for interference measurement and/or a reference resource position for interference measurement;
  • the interference measurement unit is configured to perform interference measurement according to the reference signal used for interference measurement and/or the reference resource position for interference measurement specified in the interference measurement reference information.
  • the base station specifies, through an interference measurement reference message, a reference signal used for interference measurement and/or a reference resource position for interference measurement for a terminal; and after receiving the interference measurement reference information, performs interference measurement according to the reference signal and/or the reference resource position for interference measurement specified by the base station.
  • FIG. 1 is a diagram of a CRS configuration in a distributed antenna system
  • FIG. 2 is a diagram of a relationship between a CRI-RS configuration and a service in a distributed antenna system
  • FIG. 3 is a diagram of notifying a reference resource position for interference measurement according to an embodiment of the present document.
  • the present embodiment provides a method for notifying interference measurement reference information, comprising:
  • a base station notifying a terminal of interference measurement reference information which specifies a reference signal used for interference measurement and/or a reference resource position for interference measurement.
  • the reference signal used for interference measurement specified in the interference measurement reference information comprises a CRS, or a CSI-RS.
  • the reference resource position for interference measurement specified in the interference measurement reference information is a set of part of Resource Elements (REs) within one or more Transmission Time Intervals (TTIs).
  • REs Resource Elements
  • TTIs Transmission Time Intervals
  • the set of part of REs within the TTI is a set of multiple incompletely continuous REs, wherein, the RE is a minimum resource unit defined for the LTE.
  • the terminal performs interference measurement according to the reference signal used for interference measurement and/or the reference resource position for interference measurement specified in the interference measurement reference information notified by the base station.
  • the base station notifies the terminal of the reference signal used for interference measurement and/or the reference resource position for interference measurement by using high-level signaling.
  • the interference measurement reference information may be 1-bit or 2-bit indication information.
  • the base station may further jointly encode the reference signal used for interference measurement together with a channel measurement reference information indication.
  • the scenario described in this embodiment is based on a distributed multi-antenna system, wherein, the configuration of antennas and antenna ports is as shown in FIG. 2 .
  • a base station determines a channel measurement reference pilot of a terminal to be a CSI-RS, and the terminal selects a serving node according to the CSI-RS.
  • UE 1 selects a serving node as Remote Radio Head (RRH 1 ), at a co-time co-frequency position where the RRH 1 serves UE 1 , RRH 2 also serves UE 2 , RRH 3 also serves UE 3 , and Macro also serves UE 4 .
  • RRH 1 Remote Radio Head
  • RRH 2 also serves UE 2
  • RRH 3 also serves UE 3
  • Macro also serves UE 4 .
  • the UE is interfered by signals transmitted by the RRH 2 , RRH 3 and Macro.
  • Such transmitted signals not only interfere with the data of UE 1 , but also interfere with the CSI-RS of UE 1 .
  • RRH 2 , RRH 3 and Macro do not transmit data and a CRS reference signal is transmitted jointly by the RRH 1 , RRH 2 , RRH 3 and Macro for SFN combining Therefore, the CRS can not embody the interference experienced by the user data.
  • the base station selects the CSI-RS as an interference measurement reference signal at this time, and notifies the terminal of the interference measurement reference information through high-level signaling.
  • the terminal After receiving the interference measurement reference information, the terminal performs interference measurement according to the CSI-RS.
  • the scenario described in this embodiment is based on a distributed multi-antenna system, wherein, the configuration of antennas and antenna ports is as shown in FIG. 2 .
  • the base station determines a channel measurement reference pilot of a terminal as the CRS, and it is a TDD mode, the terminal does not feed back the PMI and RI, and only feeds back the CQI.
  • the terminal measures RSRP (large-scale fading channel information, which embodies a distance between a user and a transmission node) according to the CSI-RS to select a serving node.
  • RSRP large-scale fading channel information, which embodies a distance between a user and a transmission node
  • UE 1 selects the serving node as RRH 1 , at a co-time co-frequency position where the RRH 1 serves UE 1 , RRH 2 also serves UE 2 , RRH 3 also serves UE 3 , and Macro also serves UE 4 .
  • the UE is interfered by signals transmitted by the RRH 2 , RRH 3 and Macro.
  • Such transmitted signals not only interfere with the data of UE 1 , but also interfere with the CSI-RS of UE 1 .
  • the RRH 2 , RRH 3 and Macro do not transmit data and a CRS reference signal is transmitted jointly by the RRH 1 , RRH 2 , RRH 3 and Macro for SFN combining Therefore, the CRS can not embody the interference experienced by user data.
  • the base station selects the CSI-RS as an interference measurement reference signal at this time, and notifies the terminal of the interference measurement reference information through high-level signaling.
  • the terminal After receiving the interference measurement reference information, the terminal performs interference measurement according to the CSI-RS.
  • the scenario described in this embodiment is based on a distributed multi-antenna system, wherein, the configuration of antennas and antenna ports is as shown in FIG. 2 .
  • the base station determines a channel measurement reference pilot of a terminal as the CRS, and the demodulation pilot is also the CRS.
  • various nodes use the same SFN combining mode as the CRS to transmit data to the same user.
  • all co-time co-frequency nodes only serve the same user, and there is no interference due to transmitted signals from nodes within a cell, and there is only the interference due to transmitted signals from nodes outside the cell.
  • the base station selects the CRS as an interference measurement reference signal, and notifies the terminal of the interference measurement reference information through high-level signaling.
  • the terminal After receiving the interference measurement reference information, the terminal performs interference measurement according to the CRS.
  • the base station may use 1-bit information, which represents 2 states respectively, specifically as shown in table 2 below:
  • Interference measurement reference information table one State Meaning 0 performing interference measurement according to a CRS 1 performing interference measurement according to a CSI-RS
  • 2-bit information may also be used, which represents 4 states, specifically as shown in table 3 below:
  • Interference measurement reference information table two State Meaning 00 performing interference measurement according to a CRS 01 performing interference measurement according to a CSI-RS 10 performing interference measurement according to a DMRS 11 performing interference measurement according to data
  • the base station jointly encodes a channel measurement reference information indication together with interference measurement reference information.
  • a condition of 2-bit may be used, as shown in table 4 below, which represents 4 states respectively.
  • Interference measurement reference information table three State Meaning 00 performing channel measurement according to a CRS, and performing interference measurement according to a CRS 01 performing channel measurement according to a CRS, and performing interference measurement according to a CSI-RS 10 performing channel measurement according to a CSI-RS, and performing interference measurement according to a CRS 11 performing channel measurement according to a CSI-RS, and performing interference measurement according to a CRS
  • the base station can substitute the above mode of notifying an interference measurement reference pilot with a mode of notifying a reference resource position for interference measurement.
  • RB Resource Block
  • the base station can use a set of REs in one or more specified TTIs when notifying the reference resource position for interference measurement.
  • the base station notifies the UE that the reference resource position of the interference is the following set of REs within one TTI:
  • the base station notifies the UE that the reference resource position of the interference is the following set of REs within one TTI:
  • (k,l) represents a RE, and the set is ⁇ (0,5), (0,6), (0,12), (0,13), (1,5), (1,6), (1,12), (1,13), (5,5), (5,6), (5,12), (5,13), (6,5), (6,6), (6,12), (6,13), (10,5), (10,6), (10,12), (10,13), (11,12), (11,5), (11,6), (11,13) ⁇ .
  • the base station notifies the UE that the reference resource position of the interference is the following set of REs within one TTI:
  • inventions of the present document further provide an apparatus for notifying interference measurement reference information, applied in a base station, comprising:
  • a reference information notification unit configured to notify a terminal of interference measurement reference information which specifies a reference signal used for interference measurement and/or a reference resource position for interference measurement.
  • the reference information notification unit is configured to specify the following reference signals used for interference measurement in the interference measurement reference information: a Common Reference Signal (CRS), or a Channel State Information-Reference Signal (CSI-RS).
  • CRS Common Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the reference information notification unit is configured as that the reference resource position for interference measurement specified in the interference measurement reference information is a set of part of REs within one or more TTIs, wherein, the set of REs is a set of multiple incompletely continuous REs.
  • the reference information notification unit is configured to notify the terminal of the interference measurement reference information using high-level signaling and specify the reference signal used for interference measurement and/or the reference resource position for interference measurement in the high-level signaling.
  • the reference information notification unit is configured to:
  • the embodiments of the present document further provide an apparatus for measuring interference, applied in a terminal, comprising a reference information reception unit and an interference measurement unit, wherein,
  • the reference information reception unit is configured to receive interference measurement reference information notified by a base station, which specifies a reference signal used for interference measurement and/or a reference resource position for interference measurement;
  • the interference measurement unit is configured to perform interference measurement according to the reference signal used for interference measurement and/or the reference resource position for interference measurement specified in the interference measurement reference information.
  • each module or each step of the aforementioned present document can be implemented with general computing devices, and can be integrated in a single computing device, or distributed onto a network consisting of a plurality of computing devices; alternatively, they can be implemented with program codes executable by the computing devices, and therefore, they can be stored in storage devices to be executed by the computing devices; and in some cases, steps illustrated or described may be implemented in an order different from the order herein, or they are respectively made into a plurality of integrated circuit modules; alternatively, it is implemented with making several modules or steps of them into a single integrated circuit module.
  • the present document is not limited to any specific combinations of hardware and software.
  • the base station specifies, through an interference measurement reference message, a reference signal used for interference measurement and/or a reference resource position for interference measurement for a terminal; and after receiving the interference measurement reference information, the terminal performs interference measurement according to the reference signal and/or the reference resource position for interference measurement specified by the base station.

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